Determining the dimensions of cookware, specifically a skillet, typically involves measuring the diameter across the top inner edge. This measurement, usually expressed in inches, defines the nominal size. For example, a skillet with a 10-inch diameter across the top inner edge is considered a 10-inch skillet.
Accurate knowledge of cookware dimensions is crucial for recipe adaptation, ensuring correct portion sizes, and selecting the appropriately sized lid. Historically, precise sizing standardized cookware, facilitating trade and ensuring consistent cooking results across different regions.